Update plot areas for the given font sizes.

[ma-laforge]

Also:
Layout changes are made to defaults instead of user-overwrites.

Fix for issue: JuliaPlots/InspectDR.jl#25

[ma-laforge]

Sorry. Should probably have mentioned this affects only InspectDR backend.

[codecov]

Codecov Report

Merging #3430 (b46f6fb) into master (0a70359) will not change coverage.
The diff coverage is n/a.

❗ Current head b46f6fb differs from pull request most recent head 9da550b. Consider uploading reports for the commit 9da550b to get more accurate results

@@           Coverage Diff           @@
##           master    #3430   +/-   ##
=======================================
  Coverage   63.64%   63.64%           
=======================================
  Files          27       27           
  Lines        6582     6582           
=======================================
  Hits         4189     4189           
  Misses       2393     2393           

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[daschw]

Thanks!